MetaMask is a bridge that allows you to visit the distributed web of tomorrow in your browser today. It allows you to run Ethereum dApps right in your browser without running a full Ethereum node.
MetaMask includes a secure identity vault, providing a user interface to manage your identities on different sites and sign blockchain transactions.
The most easy way to use Ethereum at the momentCons:
Still, not so easy and required good knowledge of ETH network
One of the easiest way to use ETH, even though the UX is still far of the non-crypto standard. Confortable to use, it is simple to manage multiple wallet and to switch network.
Oh, and the interface can be quite slow when cats get stuck in the tubes.Marc-Antoine has used this product for one week.
One of the most "user friendly" ways to spend tokens right now. Great for devs trying to utilize Web3 for building on EthereumCons:
UX is still not great (which says something about crypto UX in general that this is one of the best out there)
Metamask is one of the only ways for people to interact directly with Ethereum apps at the moment. They have an early mover headstart but will have to work on their UX if they want to stay ahead.Nick Neuman has used this product for one year.